<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		<div id="app">
			
		</div>
		<script type="text/javascript">
			let app = document.getElementById("app");
			let text = "haha";
			app.innerText = text;
		</script>
	</body>
</html>
